UBR® Collapsible Stock -Olive Drab


In stock

SKU: 24590


The Magpul UBR (Utility / Battle Rifle), is a fully-featured, adjustable buttstock for the AR15/M4. Unlike typical collapsing stocks, this modular design offers the stability of a fixed stock with consistent cheek weld in any position.Seven-position length-of-pull (LOP) adjustment is quickly executed with gross motor movement while the integral preset system allows direct access to a preferred position. A robust lock mechanism and multi-shell construction increase durability under severe impact conditions experienced during malfunction clearing and accommodates large-bore AR calibers with ease. The UBR also provides extra counterbalance weight to improve handling on full-length rifles and weapons with muzzle-heavy accessories or bull-barrels. Optional components such as dual-side sling mounts and metal strike plate allow the UBR to adapt to the mission at hand.

Made in U.S.A.


  • Mounts on durable Entry-Length Receiver Extension tube (included) to accommodate the common M4 carbine buffer and spring∗
  • 7-Position LOP adjustability with customizable preset system for fast access to preferred length
  • Adjustment lever requires only gross motor movement to operate yet the entire stock remains streamlined and anti-snag
  • Solid “fixed stock” lockup and consistent cheek weld in all positions
  • Enhanced lock mechanism w/ internal impact buffer increases drop strength and shock resistance
  • Multi-shell construction provides solid foundation and shields critical operating parts from penetration damage
  • Sloping cheek weld combines a slim profile with user comfort
  • Stout construction provides counterbalance weight for improved weapon balance and handling
  • Storage compartment in tail of stock is removable and the door is reversible for user preference
  • Removable 0.30″ Rubber Butt-Pad offers an anti-slip surface and increased impact protection
  • Sling Mounts
    • Front/Rear – Reversible QD swivel sling mounts fit up to 1.5″ push-button swivels (swivel not included)
    • Bottom – 1.25″ sling loop

International Traffic in Arms Regulations Controlled Product
UBR Collapsible Stock

  • Weight: 23.5 oz.
  • Weight, w/Entry Receiver Extension: 26.1 oz.
  • Length, Stock: 8.0-11.4 in.
  • LOP Adjustment: 7-Position (0.56″/position)
  • LOP Adjustment Range: 3.4 in.
  • LOP, M4 Collapsed: ∼11.1 in.
  • LOP, M4 Extended: ∼14.5 in.

∗The UBR includes the necessary Entry-Length Receiver Extension tube and all mounting hardware. An M4 carbine buffer and spring are required for use with the UBR and are not included.7.62×51 ARs may require the use of a custom short buffer and spring.

∗∗Specifications based on factory configuration

Additional information

Additional information

Weight 2.1 lbs

Item #


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